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Triangle ABC is a right triangle, and mC is 78°.


What is mA?

Triangle ABC is a right triangle, and mC is 78°. What is mA?-example-1

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Dios es la respuesta!!!
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the interior sum of a triangle is 180°. and the square in a right angle means it is a 90° angle. so 78+90 is 168. and 180-168 is 12, so its b)
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